Mac network control register – Rainbow Electronics AT75C220 User Manual
Page 37

AT75C220
37
MAC Network Control Register
Register Name: ETH_CTL
Access Type: Read/write
Reset Value: 0x0
•
LB
Loopback. Optional.
•
LBL
Loopback local. Connects TXD to RXD, TXEN to RXDV, forces full duplex and drives RXCLK and TXCLK with HCLK
divided by 4.
•
RE
Receive enable. When set, enables the Ethernet MAC to receive data.
•
TE
Transmit enable. When set, enables the Ethernet transmitter to send data.
0x74
ETH_RJB
Receive jabbers
Read/write
0x0
0x78
ETH_USF
Undersize frames
Read/write
0x0
0x7C
ETH_SQEE
SQE test errors
Read/write
0x0
0x80
ETH_DRFC
Discarded RX frames
Read/write
0x0
Address Registers
0x90
ETH_HSH
Hash Register [63:32]
Read/write
0x0
0x94
ETH_HSL
Hash Register [31:0]
Read/write
0x0
0x98
ETH_SA1L
Specific address 1, first 4 bytes
Read/write
0x0
0x9C
ETH_SA1H
Specific address 1, last 2 bytes
Read/write
0x0
0xA0
ETH_SA2L
Specific address 2, first 4 bytes
Read/write
0x0
0xA4
ETH_SA2H
Specific address 2, last 2 bytes
Read/write
0x0
0xA8
ETH_SA3L
Specific address 3, first 4 bytes
Read/write
0x0
0xAC
ETH_SA3H
Specific address 3, last 2 bytes
Read/write
0x0
0xB0
ETH_SA4L
Specific address 4, first 4 bytes
Read/write
0x0
0xB4
ETH_SA4H
Specific address 4, last 2 bytes
Read/write
0x0
31
30
29
28
27
26
25
24
–
–
–
–
–
–
–
–
23
22
21
20
19
18
17
16
–
–
–
–
–
–
–
–
15
14
13
12
11
10
9
8
–
–
–
–
–
–
–
BP
7
6
5
4
3
2
1
0
WES
ISR
CSR
MPE
TE
RE
LBL
LB
Table 15. Ethernet MAC Register Map (Continued)
Offset
Register Name
Description
Access
Reset Value